Our multi-epoch calibrated spectra are presented in Fig. REF . The spectra, from the \(B\)  to the \(R\)  band, show variations in the continuum flux. Many photospheric lines in absorption are present, indicative of a K7 star [1]}. Among them, the Lii 6707 Å transition is the most prominent. Additionally, we detect an overwhelming number of emission lines, typically originating from the circumstellar environment of RU Lup such as accretion shocks, winds, jet, and chromosphere. For the purposes of this paper, we select a number of lines that are widely used to trace accretion and ejection activity in CTTS.
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